Remote Pyramid-Shaped Phosphor Coating for Phosphor-Converted White LEDs

• 作者: Nahida Nazim Musayeva Rasim Baba Jabbarov Samir Kamal Orujov Sevda Hasan Abdullayeva Teymur Yashar Orujov
• 来源期刊: 纳米科学与工程(英文)
• 学科: 工学
• 关键词: LIGHT EMITTING Diode (LED) Chip-On Board (COB) PACKAGE LIGHT Extraction Efficiency Total Internal Reflection (TIR)
• 年，卷（期）: 2017,（2）
• 页码范围: 17-24
• 页数: 8页
• 分类号: TN3

摘要

Increasing light extraction efficiency is an important task when it comes to manufacturing a powerful white light emitting diode with high luminous flux per watt. In this paper the fabrication of a pyramid-shaped 3-dimensional phosphor coating is reported. It is represented by a phosphor cover, shaped into an array of pyramid like formations. It is proposed that such a structure can improve the light extraction efficiency and the color distribution characteristics of any phosphor-converted white LED. The luminous flux and luminous efficacy are being studied as a function of the forward current across the die. It was found out that with this kind of technique it was possible to achieve an 8% - 14% increase in the efficacy of the pc-LED. This increase of light output power is being attributed to the reduction of the phenomena of total internal reflection (TIR) inside the packaging module.